<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <title>CSS Test: Specifying em/ex on the root element</title>
        <link rel="author" title="Microsoft" href="http://www.microsoft.com/" />
        <link rel="help" href="http://www.w3.org/TR/CSS21/syndata.html#length-units" />
        <meta name="flags" content="ahem" />
        <meta name="assert" content="Units 'em' and 'ex' refer to the initial value of the property when specified on the root element of a document." />
        <style type="text/css">* { margin: 0; padding: 0 }
            html
            {
                border: 1px solid;
                font: 20px/1 Ahem;
                margin-left: 20em;
                margin-top: 20ex;
            }
            div
            {
                position: absolute;
            }
            #div1
            {
                background: orange;
                height: 20px;
                left: 0;
                top: 320px;
                width: 400px;
            }
            #div2
            {
                background: blue;
                height: 320px;
                left: 400px;
                top: 0;
                width: 20px;
            }
            p
            {
                font: 16px serif;
            }
        </style>
    </head>
    <body>
        <p>Test passes if the black box containing this text is to the right of the orange box and below the blue box.</p>
        <div id="div1"></div>
        <div id="div2"></div>
    </body>
</html>